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Q: Difference between 95 percent and 99 percent confidence interval?
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Is a 95 percent confidence interval for a mean wider than a 99 percent confidence interval?

No, it is not. A 99% confidence interval would be wider. Best regards, NS


What is the Z value for 91 percent confidence interval estimation?

The Z-value for a one-sided 91% confidence interval is 1.34


What would happen to the width of the confidence interval if the level of confidence is lowered from 95 percent to 90 percent?

decrease


What does a 95 percent confidence interval tell you about the population proportion?

There is a 95% probability that the true population proportion lies within the confidence interval.


What is z value for 90 percent confidence interval?

For a two-tailed interval, they are -1.645 to 1.645


When the sample size and sample standard deviation remain the same a 99 percent confidence interval for a population mean will be narrower than the 95 percent confidence interval for the mean?

Never!


When comparing the 95 percent confidence and prediction intervals for a given regression analysis what is the relation between confidence and prediction interval?

Confidence interval considers the entire data series to fix the band width with mean and standard deviation considers the present data where as prediction interval is for independent value and for future values.


What is the z value for 75 percent confidence interval estimation?

1.15


What is the Z value for 95 percent confidence interval estimation?

1.96


What is the Z value for 99 percent confidence interval estimation?

ss


What is the confidence interval for 85 percent?

it would be with a level of significance of 0.15.


How do you produce a new confidence interval with a larger width?

Increase your percent confidence to provide an increased width.